So? Time travel is not a one way street. They have obviously worked it out. They have consistently been saying Michelle Yeoh will be in season 3 of Discovery before moving to S31 series. And S31 series showrunners (Bo and Erika) are on Discovery season 3 writing staff and are already working on Section 31 pilot script. How she comes back in time is not really important and they have obviously worked it out.
What if Georgiou didn't actually go to the future ? What if, after defeating Leland, she secreted off the ship, in an escape pod, before they went through the wormhole, and goes into hiding for a while to weigh up her options, free of Starfleet's interference ? Just speculating.
I've watched a little Star Trek here and there. Seems to me that if you toss a cat in the show there's good odds it will hit something that will send it back in time.
When working in Hong Kong, she made as many as six movies a year. More recently she was on the TV series Strike Back and Marco Polo across 2 years while also making 4 films during the same period. So in my opinion, With elegance and grace, a kick to the fact and a decent dolop of snark.
I don't normally hate on fandom but they should just have her on both Discovery and Section 31 with no explanation (remember Spock's order) just to drive everyone mad.
Fun fact: In the Kelvin universe's Mirror universe, when Connolly was having a self-absorbed trip on the transporter pad, he triggered a transporter accident, and he and Georgiou merged. The new Emperor elected not to be separated, but forced the transporter chiefs to be merged too. Er, what was the topic again? Ah, right. No, Connergiou refused to have anything to do with the black ops of the silly prime universe. Their words, not mine.